SAT (Stage-1) Mock Test

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SAT (Stage-1) Mock Test - 81

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Weekly Quiz Competition

Question 1
1 / -0

The elements given below represent the period II of the periodic table:

Li Be B C N O F Ne

Identify the elements with the largest and the smallest atomic radii.

A
Li has the largest atomic radius.
Ne has the smallest atomic radius.

B
Ne has the largest atomic radius.
Li has the smallest atomic radius.

C
F has the biggest atomic radius.
Li has the smallest atomic radius.

D
Li has the largest atomic radius.
F has the smallest atomic radius.

Solution

On moving across a period, the effective nuclear charge increases and the radius decreases.
However, noble gases have a complete octet configuration (except Helium, which has a duplet configuration) and have radii values (Vander Waal's radii), which are slightly bigger than radii of the halogens.
Question 2
1 / -0

Which of the following categories of reactions is/are always exothermic?

A. Decomposition
B. Neutralization
C. Combination
D. Double displacement

A
A and C

B
B and D

C
B and C

D
A and D

Solution

Neutralization and combination reactions are always exothermic as energy is released during these processes.
Question 3
1 / -0

When a colourless aqueous solution of a substance 'X' is added to an aqueous solution of lead(II) nitrate which is also colourless, a chemical reaction occurred which was indicated by the formation of a yellow precipitate. Which of the following could be the substance 'X'?

A
KCl

B
NaCl

C
KI

D
CuSO₄

Solution

The yellow precipitate is that of lead iodide. Hence the substance 'X' could be KI.

Pb(NO₃)₂+ 2KI → PbI₂+ 2KNO₃

Options (1), (2) and (4) are incorrect because chlorides and sulphates of lead are white salts.

Moreover the aqueous solution of copper sulphate is blue not colourless.
Question 4
1 / -0

What is the name given to the plants produced from cross-pollination of parent plants?

A
F3 plants

B
F1 plants

C
F2 plants

D
F4 plants

Solution

F1 plants are the plants produced by cross-pollination of parent plants. If one parent has dominant traits and the other has recessive traits, the F1 generation will typically be heterozygous.
Question 5
1 / -0

Male offspring of which of the following couples has the highest chance of haemophilia?

A
Haemophiliac father and normal, non-carrier mother

B
Haemophiliac father and normal, carrier mother

C
Normal father and normal, carrier mother

D
Normal father and haemophiliac mother

Solution
Question 6
1 / -0

From a cross AABb x aaBb, the genotypes AaBB : AaBb : Aabb : aabb are obtained in the ratio of

A
1 : 1 : 1 : 1

B
1 : 2 : 1 : 0

C
0 : 3 : 1 : 0

D
1 : 1 : 1 : 0

Solution
Question 7
1 / -0

A cross between a tall pea plant (TT) and a short pea plant (tt) resulted in progeny that were all tall plants because

A
tallness is a dominant trait

B
shortness is a dominant trait

C
tallness is a recessive trait

D
height of a pea plant is not governed by the gene 'T' or 't'

Solution

A cross between a tall pea plant (TT) and a short pea plant (tt) resulted in progeny that were all tall plants because tallness is a dominant trait. This is a case of monohybrid cross; in which all the progeny in the F1 generation show dominant character. Hence, tallness is the dominant trait.
Question 8
1 / -0

The characters transmitted from parents to offspring are present in

A
cytoplasm

B
ribosome

C
Golgi bodies

D
genes

Solution

Transmission of the characters occurs through genes, which are the nucleotide of a specific sequence and form a part of a chromosome. Genes are carried out and transmitted to the next generation through meiosis and reproduction, which in turn, lead to heredity characters in the offspring.
Question 9
1 / -0

Humans cannot digest cellulose whereas cows can do so because

A
cow's gut contains certain bacteria capable of digesting cellulose

B
cows have a many-chambered stomach

C
cows have efficient molars for grinding

D
cows produce acids which can digest cellulose

Solution

Digestive systems of some animals and insects include cellulase, whereas that of human beings lacks this critical enzyme. That is the main reason that human beings cannot digest cellulose.
Question 10
1 / -0

A starving man first consumes his

A
reserve of vitamins

B
fat reserve

C
glycogen reserve

D
protein reserve

Solution

In the absence of dietary sugars and carbohydrates, glucose is obtained from the breakdown of stored glycogen.
Question 11
1 / -0

Some people suffer from bloating and flatulence after ingesting sucrose because it cannot be digested. The enzyme deficient in these people is

A
lipase

B
amylase

C
sucrase

D
peptidase

Solution

Sucrase is the enzyme responsible for breakdown of sucrose. In its absence, sucrose accumulates in the intestine and is fermented by bacteria causing gastrointestinal problems like flatulence and bloating.
Question 12
1 / -0

Which of the following statements is/are false?

a. An ecosystem is a self-contained unit of living things and their non-living environment.
b. An ecosystem needs the input of sunlight energy for its functioning.
c. Abiotic components of an ecosystem mean living components and biotic components mean non-living components.

A
Only a

B
Both a and b

C
Only b

D
Only c

Solution

This is the correct option as this statement is false. Abiotic components of an ecosystem are non-living components and biotic components are living components.
Question 13
1 / -0

In the following food chain, which of the organisms are phytoplanktons?

Algae → Protozoa → Small fish → Big fish → Human beings

A
Human beings

B
Protozoa

C
Big fish

D
Algae

Solution

In the food chain, algae are the phytoplanktons. Phytoplanktons are the microscopic aquatic plants freely floating on the water.
Question 14
1 / -0

Which of the following diagrams illustrates binary fission in amoeba most appropriately?

A
(I)

B
(II)

C
(III)

D
(IV)

Solution
Question 15
1 / -0

If Hydra is cut into two parts, it does not die because _________.

A
it can form a bud

B
it can regenerate into two complete organisms

C
it can produce spores

D
the two parts are new individuals

Solution

On being cut, the two parts of Hydra can regenerate the other part because it is a simple organism. Bud also helps it in reproduction, but on being cut, regeneration ability plays the role. The two parts cannot be two individuals unless they regenerate. Lastly, Hydra does not produce spores as it reproduces by budding.

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SAT (Stage-1) Mock Test - 81

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SAT (Stage-1) Mock Test - 81

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Question 1

Li has the largest atomic radius. Ne has the smallest atomic radius.

Ne has the largest atomic radius. Li has the smallest atomic radius.

F has the biggest atomic radius. Li has the smallest atomic radius.

Li has the largest atomic radius. F has the smallest atomic radius.

Solution

Question 2

A and C

B and D

B and C

A and D

Solution

Question 3

KCl

NaCl

KI

CuSO4

Solution

Question 4

F3 plants

F1 plants

F2 plants

F4 plants

Solution

Question 5

Haemophiliac father and normal, non-carrier mother

Haemophiliac father and normal, carrier mother

Normal father and normal, carrier mother

Normal father and haemophiliac mother

Solution

Question 6

1 : 1 : 1 : 1

1 : 2 : 1 : 0

0 : 3 : 1 : 0

1 : 1 : 1 : 0

Solution

Question 7

tallness is a dominant trait

shortness is a dominant trait

tallness is a recessive trait

height of a pea plant is not governed by the gene 'T' or 't'

Solution

Question 8

cytoplasm

ribosome

Golgi bodies

genes

Solution

Question 9

cow's gut contains certain bacteria capable of digesting cellulose

cows have a many-chambered stomach

cows have efficient molars for grinding

cows produce acids which can digest cellulose

Solution

Question 10

reserve of vitamins

fat reserve

glycogen reserve

protein reserve

Solution

Question 11

lipase

amylase

sucrase

peptidase

Solution

Question 12

Only a

Both a and b

Only b

Only c

Solution

Li has the largest atomic radius.
Ne has the smallest atomic radius.

Ne has the largest atomic radius.
Li has the smallest atomic radius.

F has the biggest atomic radius.
Li has the smallest atomic radius.

Li has the largest atomic radius.
F has the smallest atomic radius.

CuSO₄